JP2009298323A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dry and regenerate an anti-fog film 24a of a windowpane 24 while keeping inside-air circulation for reducing heat-loss due to ventilation at cold time. <P>SOLUTION: An air-conditioning control device 27, which is provided with an outside-air temperature sensor for detecting the temperature of outside-air, introduces the outside-air blowing into vehicle interior partially and temporarily to perform anti-fog glass regeneration control for drying and regenerating the anti-fog film 24a applied to the windshield 24 in addition to usual air-conditioning control in the case where the outside-air temperature detected by the outside-air temperature sensor is not more than the predetermined temperature. By this, an inside air ratio can be raised while keeping an anti-fog state by partially introducing the outside-air to dry and regenerate the anti-fog film 24a while performing the inside-air circulation for reducing the heat-loss due to the ventilation at the cold time. In addition, the inside air ratio can be raised for reducing the ventilation heat-loss when traveling by temporarily introducing the outside-air utilizing parking/stopping or the like at the cold time so as to dry and regenerate the anti-fog film 24a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner disposed in a vehicle having an antifogging film on the inner surface of a window glass, and more particularly to antifogging glass regeneration control for drying and regenerating the antifogging film.

  In recent years, more low fuel consumption has been demanded for vehicles in response to carbon dioxide emission regulations. On the other hand, fuel efficiency technologies such as hybridization reduce the amount of exhaust heat from the vehicle running engine, and there is a concern that the heating heat source will be insufficient during cold weather. One factor that causes a shortage of heat sources during cold weather is that the introduction of outside air is conventionally used to prevent window fogging.

On the other hand, in the following Patent Document 1, air-conditioning control that determines window fogging using a humidity detection device and reduces the heat loss due to ventilation by compensating for the shortage of the heat source by evaporating inside in a non-fogging range. The method is shown. Moreover, in glass, there exists anti-fog glass which formed the film | membrane which maintains anti-fog performance on the surface of glass as shown by following patent document 2 and 3. FIG.
JP 2006-256696 A JP 2001-146585 A JP 2003-231827 A

  However, in the above-described air conditioning control method, not only the window glass portion in the vicinity where the humidity detection device is disposed, but also the window glass portion that is easily fogged in other places is not clouded while taking into account the variation of the humidity detection device. If the safety factor is increased as described above, there is a problem in that it is not possible to sufficiently evaporate and the fuel efficiency cannot be improved.

  In addition, the above-described antifogging glass can maintain the antifogging state to some extent, but if it exceeds the limit moisture content, it will be saturated and window fogging will occur. It is necessary to regenerate the antifogging performance. However, when heating the glass with heat rays, a large amount of power is required, and when the warm air from the air conditioner is blown out from the defroster, not only does the face shine on the occupant, but the heat source becomes insufficient, resulting in a feeling of comfort and low Fuel consumption will be impaired.

  Therefore, the present invention has been made paying attention to such problems existing in the prior art, and a first object of the present invention is to provide a vehicle having an antifogging film on the inner surface of a window glass and ventilate in cold weather. An object of the present invention is to provide a vehicle air conditioner capable of drying and regenerating an antifogging film while maintaining internal vaporization for reducing heat loss due to heat.

  In addition, the second object is to provide a vehicle with an anti-fogging coating on the inner surface of the window glass so that the anti-fogging coating is dried and regenerated, for example, by using a parking stop in cold weather. An object of the present invention is to provide a vehicle air conditioner capable of increasing the internal evaporation rate for reducing heat loss.

In order to achieve the above object, the present invention employs the following technical means. That is, the invention according to claim 1 is a vehicle air conditioner disposed in a vehicle having an anti-fogging coating (24a) on the inner surface of the window glass (24), and the inside air inlet (2, 3) and Air introduced through the inside / outside air switching means (5, 6), the inside air introduction port (2, 3), and the outside air introduction port (4) that opens and closes the outside air introduction port (4) to switch between the intake of the inside air and the outside air. Air blowing means (7) for blowing air toward the vehicle interior, a cooling heat exchanger (12) for cooling the air blown by the air blowing means (7), and heating heat for heating the air blown by the air blowing means (7) A defroster that blows out air whose temperature is adjusted by passing through the exchanger (13), the cooling heat exchanger (12), and the heating heat exchanger (13) toward the inner surface of the window glass (24). Air outlets (15) and air outlets that blow out to other parts of the passenger compartment ( 7, 22) and a plurality of outlets (15, 17, 22), and outlet mode switching means (16, 18, 23) for switching the outlet mode by opening and closing the plurality of outlets (15, 17, 22). And an air conditioning control means (27) for executing the inside / outside air switching control by the inside / outside air switching means (5, 6) and the blowing mode switching control by the blowing mode switching means (16, 18, 23). In
An outside air temperature detecting means for detecting the temperature of the outside air is provided, and the air conditioning control means (27) performs partial or temporary in addition to normal air conditioning control when the outside air temperature detected by the outside air temperature detecting means is equal to or lower than a predetermined temperature. In particular, the antifogging glass regeneration control for drying and regenerating the antifogging film (24a) applied to the window glass (24) by introducing outside air into the passenger compartment is performed.

  According to the first aspect of the present invention, in cold weather, the outside air is partially introduced while the inside air is circulated to reduce heat loss due to ventilation, and the antifogging film (24a) is dried and regenerated. Thus, the internal vaporization rate can be increased while maintaining the anti-fogging state. In addition, the inside vaporization rate for reducing the heat loss of ventilation during running can be obtained by temporarily introducing outside air by using a parked vehicle during cold weather and drying and regenerating the anti-fogging film (24a). Can be increased.

  This is because with antifogging glass alone, it will become cloudy sometime because of its function, and it is unavoidable to make it outside, and only a certain amount of air can be vaporized only by the method of introducing two layers of inside and outside air by a vehicle air conditioner. Therefore, the present invention prevents the heat loss as a maximum internal air circulation during traveling, and in the case where it becomes cloudy, partially or temporarily introduces the outside air, thereby preventing the heat loss and the anti-fogging property. The film (24a) is dried and regenerated. Thereby, heating performance can be ensured with low fuel consumption while always maintaining the anti-fogging state.

  Moreover, in invention of Claim 2, in the vehicle air conditioner of Claim 1, it is arrange | positioned at the inner surface of a window glass (24), and the humidity which calculates the surface relative humidity (RHw) of a window glass (24) The detection means (25) is provided, and the air conditioning control means (27) is used as an anti-fogging glass regeneration control, and the surface relative humidity (RHw) calculated by the humidity detection means (25) is less than a predetermined first humidity threshold (RH1). Is the inside air circulation, and when the surface relative humidity (RHw) calculated by the humidity detection means (25) reaches the first humidity threshold (RH1), a part of outside air is introduced.

  According to the second aspect of the present invention, the surface relative humidity (RHw) before the window glass (24) starts to become cloudy is set to the first humidity threshold (RH1), and is less than the first humidity threshold (RH1). When the inside air circulation reaches the first humidity threshold (RH1), the inside vaporization rate can be increased while always maintaining the antifogging state by partially drying and regenerating the antifogging film (24a) as the introduction of outside air. .

  According to a third aspect of the present invention, in the vehicle air conditioner according to the first aspect, the fog detecting means (26) is disposed on the inner surface of the window glass (24) and detects the fog on the surface of the window glass (24). ), And the air conditioning control means (27) performs anti-fogging glass regeneration control. When the fogging degree detected by the fogging detection means (26) is less than the predetermined first fogging threshold (L1), the inside air is introduced, and the fogging detection means ( When the degree of fogging detected by 26) reaches the first cloudiness threshold (L1), a part of outside air is introduced.

  According to the third aspect of the present invention, the fogging degree that the window glass (24) can tolerate is set to the first fogging threshold (L1), and the inside air circulation is less than the first fogging threshold (L1). When the first fogging threshold value (L1) is reached, the antifogging film (24a) is dried and regenerated as a part of the introduction of outside air, whereby the internal vaporization rate can be further increased while always maintaining the antifogging state.

  According to a fourth aspect of the present invention, in the vehicle air conditioner according to the second or third aspect, when a part of the outside air is introduced, the introduced outside air is blown out from the defroster outlet (15), and the circulating inside air is defroster. It blows out from blower outlets (17, 22) other than a blower outlet (15).

  According to the fourth aspect of the present invention, even when the introduced outside air is mixed into the inside air and blown out into the vehicle interior, the humidity of the entire vehicle interior is reduced and the antifogging film (24a) can be dried and regenerated. Although it is possible, the direction which blows off the introduced external air toward the window glass (24) from the defroster outlet (15) can efficiently dry and regenerate the antifogging film (24a) on the inner surface. Further, for example, heating performed from the foot outlet (22) can be efficiently performed only by the inside air circulation.

  According to a fifth aspect of the present invention, in the vehicle air conditioner according to any of the second to fourth aspects, after the air conditioning control means (27) partially shifts to outside air introduction, the surface relative humidity (RHw) ) Decreases to a predetermined second humidity threshold (RH2) lower than the first humidity threshold (RH1), or when the cloudiness degree is lower than the first cloudiness threshold (L1). ), It is characterized by returning to the blowout mode in the inside air circulation and normal air conditioning control.

  According to the fifth aspect of the present invention, the surface relative humidity (RHw) and the degree of fogging are reduced to the second humidity threshold (RH2) or the second fogging threshold (L2). ) Has been regenerated, it can be returned to low fuel consumption air conditioning by internal air circulation.

  According to a sixth aspect of the present invention, in the vehicle air conditioner according to any one of the second to fourth aspects, the air conditioning control means (27) partially introduces the outside air and then introduces the inside air again. And it is characterized by returning to the blowing mode in normal air conditioning control. According to the sixth aspect of the present invention, part of the outside air may be introduced for a predetermined time, and the control can be simplified.

  According to a seventh aspect of the present invention, in the vehicle air conditioner according to the second aspect, the humidity detecting means (25) comprises a relative humidity detecting means, an air temperature detecting means, and a glass temperature detecting means, The surface relative humidity (RHw) is calculated from the detection result. According to the seventh aspect of the present invention, it is possible to detect the surface relative humidity (RHw) state before the window glass (24) starts to fog.

  According to an eighth aspect of the present invention, in the vehicle air conditioner according to the third aspect, the fogging detecting means (26) includes a light emitting element and a light receiving element, and is fogged by optical reflection on the glass surface. It is characterized by calculating the degree. According to the eighth aspect of the present invention, it is impossible to detect a state in which the window glass (24) is likely to be fogged, but it is possible to perform control to increase the internal vaporization rate as much as possible using an acceptable window fogging state as a threshold value. Thus, the cost of the fog detection means can be suppressed.

  According to a ninth aspect of the present invention, in the vehicle air conditioner according to any one of the second, third, seventh, and eighth aspects, the humidity detecting means (25) or the cloudy detecting means (26) is disposed at the rear of the vehicle. It is characterized by being arranged on the window glass. According to the ninth aspect of the present invention, the rear window glass is more susceptible to window fogging than the front window glass (24) of the vehicle. For this reason, by performing humidity detection or fogging detection with a window glass that is easily fogged, it is possible to perform air conditioning control in which any window glass of the vehicle is always maintained in an anti-fogging state.

  According to a tenth aspect of the present invention, in the vehicle air conditioner according to the first aspect, the air conditioning control means (27) performs anti-fogging glass regeneration control so that the vehicle traveling is terminated and the vehicle traveling engine is operated. After being turned off, the outside air is blown out from the defroster outlet (15) for a predetermined time. According to the tenth aspect of the present invention, the outside air is temporarily introduced by utilizing the fact that the vehicle is parked in the cold, and the antifogging film (24a) is dried and regenerated, so that the ventilation heat during traveling can be obtained. The internal vaporization rate for loss reduction can be increased.

  According to an eleventh aspect of the present invention, in the vehicle air conditioner according to the first aspect, the air conditioning control means (27) performs anti-fogging glass regeneration control so that the vehicle is stopped and an occupant is present in the passenger compartment. When there is no air, the blowout from the defroster outlet (15) is performed for a predetermined time by introducing the outside air. According to the eleventh aspect of the invention, by utilizing the cold stop, the outside air is temporarily introduced when there is no passenger in the passenger compartment, and the antifogging film (24a) is dried and regenerated. By setting it, it is possible to increase the internal vaporization rate for reducing ventilation heat loss during traveling.

  Further, in the invention according to claim 12, in the vehicle air conditioner according to claim 11, the air conditioning control means (27) is configured to perform a normal operation when an occupant is detected in the vehicle interior during the antifogging glass regeneration control. It is characterized by returning to the suction mode and the blowing mode in the air conditioning control. According to the twelfth aspect of the present invention, when the occupant returns to the passenger compartment, the comfort of the occupant is not impaired, or the air conditioning state different from the setting is not distrusted. It is something to return to. In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a vehicle air conditioner according to an embodiment of the present invention, and shows a state of an inside air suction (inside air circulation) mode and a foot defroster blowing mode. The present embodiment is effective when applied to a low heat source vehicle such as a diesel engine vehicle or a hybrid vehicle in which the temperature of engine cooling water (hot water) is relatively difficult to rise.

  The ventilation system of the air conditioner is roughly divided into two parts, a blower unit 1 and an air conditioning unit 10. The air-conditioning unit 10 part is usually arranged at a substantially central part in the left-right direction of the vehicle among the inner part of the instrument panel (not shown) in front of the vehicle interior, and the arrow shown in the figure in the vertical direction of the vehicle. It is mounted in the relationship shown.

  On the other hand, the blower unit 1 is usually arranged offset to the side (passenger seat side) of the air conditioning unit 10 in the passenger compartment. In addition, in FIG. 1, the state which has arrange | positioned the air blower unit 1 in the vehicle front side of the air conditioning unit 10 is illustrated for the reason on drawing preparation. First, the blower unit 1 will be described in detail. First and second inside air introduction ports 2 and 3 for introducing inside air (vehicle interior air) are provided on both upper and lower sides of the blower unit 1.

  One outside air introduction port 4 for introducing outside air (air outside the passenger compartment) is provided at an intermediate portion between the both inside air introduction ports 2 and 3. Then, the first inside / outside air switching door 5 is used to switch between the first outside air inlet 4a through which outside air flows from the outside air introduction port 4 and the first inside air introduction port 2, and the second outside air port 4b and the second inside air are switched. The inlet / outlet port 3 is opened and closed by a second inside / outside air switching door 6.

  The first and second inside / outside air switching doors 5 and 6 are plate-like doors that are rotated around the rotation shafts 5a and 6a. In the present embodiment, the first and second inside air introduction ports 2 and 3, the outside air introduction port 4, the first and second outside air ports 4 a and 4 b, and the first and second inside and outside air switching doors 5 and 6 are used. Inside / outside air switching means is configured.

  And the air blower (blower means) 7 which ventilates the introduction air from the said inlets 2, 3, and 4 toward a vehicle interior is the upper 1st fan 7a and the lower 2nd fan 7b in this embodiment, Arranged in the case 1 a of the blower unit 1. Both the fans 7a and 7b are made of a well-known centrifugal multiblade fan (sirocco fan), and are integrally rotated by one common electric motor 7c. Both fans 7a and 7b are accommodated in a scroll case 7d.

  FIG. 1 shows a state of an inside air suction (total inside air circulation) mode. The first inside / outside air switching door 5 releases the first inside air introduction port 2 and closes the first outside air port 4a of the outside air introduction port 4. Therefore, the inside air is sucked into the suction port 7e of the first fan 7a. Similarly, since the second inside / outside air switching door 6 opens the second inside air introduction port 3 and closes the second outside air port 4b, the inside air is also drawn into the suction port 7f of the second fan 7b. .

  In the illustrated state of FIG. 1, the first fan 7 a blows the inside air from the first inside air introduction port 2 to the upper first air passage 8 in the present embodiment, and the second fan 7 b The inside air from the second inside air introduction port 3 is blown to the second air passage 9 on the lower side. The first and second air passages 8 and 9 are partitioned by a partition member 11 disposed from the first fan 7a and the second fan 7b to the downstream side.

  Next, the air conditioning unit 10 is of a type in which both the evaporator 12 and the heater core 13 are integrated in a resin air conditioning case 10a. Also in the air conditioning case 10 a, the air passage is divided into an upper first air passage 8 and a lower second air passage 9 by a partition plate 11.

  In the air-conditioning case 10a, the evaporator 12 is disposed at the front side of the vehicle so as to cross the entire first and second air passages 8 and 9 in the air-conditioning case 10a. As is well known, this evaporator 12 is a cooling heat exchanger that cools air-conditioning air by absorbing the latent heat of evaporation of a refrigerant in a refrigeration cycle (not shown) from the air-conditioning air.

  The heater core 13 is arranged adjacent to the downstream side of the air flow (the vehicle rear side) of the evaporator 12 at a predetermined interval. The heater core 13 is a heating heat exchanger that reheats the cold air that has passed through the evaporator 12, and hot engine cooling water (hot water) flows through the heater core 13 to heat the air using the hot water as a heat source. .

  An air mix door 14 is disposed between the evaporator 12 and the heater core 13. The air mix door 14 is integrally formed with substrate portions 14a and 14b on a single rotating shaft 14c, and is rotatable about the single rotating shaft 14c. By rotating the air mix door 14, the air volume ratio between the warm air passing through the heater core 13 and the cool air bypassing the heater core 13 is adjusted in the first and second air passages 8 and 9, respectively. The temperature of the air blown into the room is adjusted.

  That is, in this embodiment, the air mix door 14 constitutes temperature adjusting means for the air blown into the vehicle interior. And the blowing mode switching part is comprised in the site | part of the air downstream side (vehicle rear side) of the heater core 13. This blow mode switching unit will be described in detail. A defroster opening (a blow outlet referred to in the present invention) 15 communicating with the first air passage 8 immediately after the heater core 13 is opened on the upper surface of the air conditioning case 10a. .

  The defroster opening 15 is for blowing wind toward the inner surface of the windshield (window glass) 24 of the vehicle via a defroster duct and a defroster outlet (not shown). The defroster opening 15 is opened and closed by a defroster door 16. The defroster door 16 is a plate-like door that is rotatable by a rotation shaft 16a.

  A face opening 17 (the air outlet in the present invention) that directly communicates with the first air passage 8 is opened at a portion of the air-conditioning case 10a closest to the vehicle rear side (close to the passenger). This face opening 17 is for blowing wind toward the front chest occupant's chest through the face duct (not shown) at the center in the width direction above the instrument panel and at both ends. is there.

  The face opening 17 is opened and closed by a face door 18. The face door 18 is a plate-like door that is rotatable by a rotation shaft 18a. In addition, a communication passage 20 that communicates between the first air passage 8 and the second air passage 9 is provided at the downstream side of the heater core 13. The communication passage 20 is opened and closed by a communication door 21. The

  The communication door 21 is a plate-like door that is rotatable by a rotation shaft 21a. When the communication door 21 is at the closed position of the communication passage 20 shown in FIG. 1, the communication door 21 is in the first and second air passages 8, 9. It plays the role of a partition member. In addition, a foot opening (an air outlet referred to in the present invention) 22 is opened in a lower portion of the air conditioning case 10a on the vehicle rear side.

  The foot opening 22 communicates with a portion of the heater core 13 on the downstream side of the air in the second air passage 9. The foot opening 22 is for blowing warm air from a foot outlet through a foot duct (not shown) to the feet of the front seat passenger. The foot opening 22 is opened and closed by a foot door 23. The foot door 23 is a plate-like door that is rotatable by a rotation shaft 23a.

  In the present embodiment, the defroster door 16, the face door 18, and the foot door 23 constitute a blowing mode switching means. The air conditioning control device (air conditioning control means referred to in the present invention) 27 includes a known microcomputer including a CPU, a ROM, a RAM, and the like, and peripheral circuits thereof. The air conditioning control device 27 stores a control program for air conditioning control in its ROM, and performs various calculations and processes based on the control program.

  The air-conditioning control device 27 receives a detection value of a humidity detection device (humidity detection means referred to in the present invention) 25 or a fog detection device (fogging detection means referred to in the present invention) 26, which will be described later. Detection signals from the air conditioning sensor group and various operation signals from an air conditioning operation panel (not shown) are input.

  Although a description of a specific structural outline of the humidity detection device 25 is omitted, a relative humidity detection means, an air temperature detection means, and a glass temperature detection means are provided inside, and the surface of the inner surface of the windshield 24 is obtained from these detection results. Relative humidity (RHw) can be calculated. In the present embodiment, the humidity detection device 25 is disposed in a portion that is behind a room mirror (not shown) inside the windshield 24.

  Although detailed description is omitted, as a characteristic configuration of the present embodiment, the windshield 24 is an antifogging glass having an inner surface provided with an antifogging film 24a. This anti-fogging glass is obtained by laminating an anti-fogging film 24a on the surface of ordinary glass, and has a function of preventing window fogging to some extent by absorbing moisture inside the ceramic coat, for example. However, this anti-fogging glass is saturated when it absorbs a predetermined amount of moisture, and fogging occurs. Moreover, it is not known when it becomes cloudy due to the amount of moisture absorbed by the ceramic coat portion.

  Next, the operation of this embodiment in the above configuration will be described. First, an outline of the operation of the air conditioner will be described. By operating the blower 7, the air introduced from the first and second inside air introduction ports 2, 3 or the outside air introduction port 4 is blown into the vehicle interior through the case 10a. Also, the refrigerant is circulated in the refrigeration cycle apparatus by energizing an electromagnetic clutch (not shown) to bring the electromagnetic clutch into a connected state and driving a compressor (not shown) with a vehicle running engine.

  The blown air of the blower 7 is first cooled and dehumidified through the evaporator 12, and this cold air is then heated through the heater core 13 according to the rotation position (opening) of the air mix door 14 to be heated. And a flow of cold air passing through the bypass passage. Therefore, by adjusting the ratio of the amount of air passing through the heater core 13 (warm air amount) and the amount of air passing through the bypass passage (cold air amount) according to the opening of the air mix door 14, the temperature of the air blown into the vehicle interior Is adjusted.

  Then, the temperature-conditioned conditioned air flows from any one or a plurality of openings among the defroster opening 15, the face opening 17, and the foot opening 22 located at the most downstream part of the air passage of the case 10a. The air is blown out into the vehicle interior via the air outlet, and air conditioning in the vehicle interior and fogging prevention of the windshield 24 of the vehicle are performed.

  Next, the characteristic operation of the present invention will be described with reference to FIG. FIG. 2 is a time chart illustrating switching of the inside / outside air mode in the first embodiment of the present invention. When a passenger enters (state 0 in FIG. 2), the temperature detected by an outside air temperature sensor (outside air temperature detecting means) (not shown) is not more than a predetermined temperature (for example, 20 ° C.), and heating is necessary and window fogging may occur. In the case of the condition, the air conditioner starts air conditioning with the suction mode set to the complete internal air circulation mode in order to reduce heat loss due to ventilation and reduce fuel consumption.

  As the vehicle travels, the surface relative humidity RHw on the inner surface of the glass increases due to the humidification of the occupant and the temperature drop of the windshield 24. Note that window fogging occurs when the surface relative humidity RHw = 100%. Therefore, the air-conditioning control device 27 performs antifogging glass regeneration control in which outside air is partially or temporarily introduced and blown out into the passenger compartment, and the antifogging film 24a applied to the windshield 24 is dried and regenerated. I have to.

  Specifically, as shown in FIG. 2, the surface relative humidity RHw (for example, 90%) before the windshield 24 starts to become cloudy is set to the first humidity threshold RH1, and the surface relative humidity RHw calculated by the humidity detection device 25 is set. However, when the surface relative humidity RHw calculated by the humidity detecting device 25 reaches the first humidity threshold RH1 (state 1 in FIG. 2), the outside air is partially circulated while it is less than the first humidity threshold RH1. Like to do.

  FIG. 3 shows a state of the two-layer suction (partial outside air introduction) mode & foot defroster blowing mode in the vehicle air conditioner of FIG. Since the first inside / outside air switching door 5 closes the first inside air introduction port 2 and opens the first outside air port 4a of the outside air introduction port 4, outside air is sucked into the suction port 7e of the first fan 7a. The On the other hand, since the second inside / outside air switching door 6 opens the second inside air introduction port 3 and closes the second outside air port 4b, the inside air is sucked into the suction port 7f of the second fan 7b. .

  In the state shown in FIG. 3, the first fan 7a blows the outside air from the outside air inlet 4 to the first air passage 8, blows out from the defroster opening 15 to the inner surface of the windshield 24, and the antifogging film 24a is exposed to the outside air. It will be dried and regenerated. Further, the second fan 7 b blows the inside air from the second inside air introduction port 3 to the second air passage 9 and heats the foot from the foot opening 22.

  As a result, when the surface relative humidity RHw calculated by the humidity detection device 25 decreases and decreases to a predetermined second humidity threshold value (for example, 70%) lower than the first humidity threshold value RH1 (state 2 in FIG. 2), again. It is made to return to the blowing mode in internal air circulation and normal air-conditioning control. Thereafter, the above operation is repeated during traveling.

  Then, when the vehicle travel is finally finished and the vehicle travel engine is turned off for parking (state 3 in FIG. 2), the air conditioning control device 27 performs the complete outdoor air regeneration control as the final antifogging glass regeneration control. In the introduction mode, the blowing from the defroster opening 15 is performed for a predetermined time (for example, 1 minute). This is to reproduce the anti-fogging function for the next boarding (state 4 in FIG. 2).

  4 shows a state of the outside air suction mode & defroster blowing mode in the vehicle air conditioner of FIG. Since the first inside / outside air switching door 5 closes the first inside air introduction port 2 and opens the first outside air port 4a of the outside air introduction port 4, outside air is sucked into the suction port 7e of the first fan 7a. The Further, since the second inside / outside air switching door 6 also closes the second inside air introduction port 3 and opens the second outside air port 4b, outside air is also sucked into the suction port 7f of the second fan 7b.

  In the illustrated state of FIG. 4, the first fan 7 a blows outside air from the outside air inlet 4 to the first air passage 8 and blows it out from the defroster opening 15 to the inner surface of the windshield 24. The second fan 7b also blows outside air from the outside air introduction port 4 to the second air passage 9, closes the foot opening 22 and opens the communication passage 20, so that the air in the second air passage 9 is opened. Is also blown out from the defroster opening 15 to the inner surface of the windshield 24. As a result, the antifogging coating 24a is dried and regenerated with all the outside air. However, when the battery capacity is not sufficient, the final antifogging glass regeneration control may not be performed.

  Next, features and effects of this embodiment will be described. First, an outside air temperature sensor that detects the temperature of outside air is provided, and the air conditioning control device 27 partially or temporarily adds to the normal air conditioning control when the outside air temperature detected by the outside air temperature sensor is equal to or lower than a predetermined temperature. Antifogging glass regeneration control for drying and regenerating the antifogging film 24a applied to the windshield 24 by introducing outside air into the passenger compartment is performed.

  According to this, while the inside air circulation is performed to reduce heat loss due to ventilation in cold weather, the outside air is partially introduced and the anti-fogging film 24a is dried and regenerated, thereby maintaining the anti-fogging state. The vaporization rate can be increased. Further, by temporarily introducing the outside air by using a parked vehicle during cold weather, etc., and drying and regenerating the anti-fogging film 24a, the internal vaporization rate for reducing ventilation heat loss during traveling is increased. be able to.

  This is because with antifogging glass alone, it will become cloudy sometime because of its function, and it is unavoidable to make it outside, and only a certain amount of air can be vaporized only by the method of introducing two layers of inside and outside air by a vehicle air conditioner. Therefore, the present invention prevents the heat loss as a maximum internal air circulation during traveling, and in the case where it becomes cloudy, partially or temporarily introduces the outside air, thereby preventing the heat loss and the anti-fogging property. The film 24a is dried and regenerated. Thereby, heating performance can be ensured with low fuel consumption while always maintaining the anti-fogging state.

  Moreover, the humidity detection apparatus 25 which is arrange | positioned at the inner surface of the windshield 24, and calculates the surface relative humidity RHw of the windshield 24 is provided, and the air-conditioning control apparatus 27 is the surface relative humidity which the humidity detection apparatus 25 calculates as anti-fog glass reproduction | regeneration control. While the RHw is less than the predetermined first humidity threshold value RH1, the inside air circulation is performed, and when the surface relative humidity RHw calculated by the humidity detection device 25 reaches the first humidity threshold value RH1, a part of outside air is introduced. .

  According to this, the surface relative humidity RHw before the windshield 24 starts to become cloudy is set to the first humidity threshold value RH1, and when it reaches less than the first humidity threshold value RH1, the inside air is circulated. As the introduction, by drying and regenerating the antifogging film 24a, it is possible to increase the internal vaporization rate while always maintaining the antifogging state.

  In addition, when a part of the outside air is introduced, the introduced outside air is blown out from the defroster opening 15, and the circulating inside air is blown out from the openings 17 and 22 other than the defroster opening 15. According to this, even if the introduced outside air is mixed into the inside air and blown out into the vehicle interior, the humidity of the entire vehicle interior can be reduced and the antifogging film 24a can be dried and regenerated. Blowing out toward the windshield 24 from the defroster opening 15 can efficiently dry and regenerate the antifogging film 24a on the inner surface. Further, for example, heating performed from the foot opening 22 can be efficiently performed only by the inside air circulation.

  In addition, after the air conditioning control device 27 shifts to the introduction of a part of the outside air, when the surface relative humidity RHw falls to a predetermined second humidity threshold RH2 lower than the first humidity threshold RH1, the inside air circulation and normal air conditioning are performed again. It is made to return to the blowing mode in control. According to this, since the surface relative humidity RHw has decreased to the second humidity threshold RH2, it can be determined that the anti-fogging coating 24a has been regenerated, and the fuel-efficient air conditioning by the internal air circulation can be restored.

  The humidity detection device 25 includes a relative humidity detection unit, an air temperature detection unit, and a glass temperature detection unit, and calculates the surface relative humidity RHw from these detection results. According to this, it is possible to detect the surface relative humidity RHw state before the windshield 24 begins to cloud.

  In addition, the air conditioning control device 27 performs antifogging glass regeneration control so that after the vehicle travels and the vehicle travel engine is turned off, the blowout from the defroster opening 15 is performed for a predetermined time by introducing outside air. Yes. According to this, outside air is temporarily introduced using the fact that the vehicle is parked in cold weather, and the anti-fogging film 24a is dried and regenerated, thereby reducing the internal vaporization rate for reducing ventilation heat loss during traveling. Can be increased.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a time chart for explaining switching of the inside / outside air mode in the second embodiment of the present invention. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described.

  In the present embodiment, instead of the humidity detection device 25 described above, a fogging detection device 26 that is disposed on the inner surface of the windshield 24 and detects fogging on the surface of the windshield 24 (see FIG. 1) is provided. When the fogging degree detected by the fogging detection device 26 is less than the predetermined first fogging threshold L1, the inside air is introduced as the fogged glass regeneration control, and the fogging degree detected by the fogging detection device 26 reaches the first fogging threshold L1. Are trying to introduce some outside air.

  According to this, the degree of fogging that can be allowed by the windshield 24 is set to the first fogging threshold L1, and the inside air circulation is achieved while less than the first fogging threshold L1, and part of the outside air is introduced when the first fogging threshold L1 is reached. By drying and regenerating the antifogging film 24a, it is possible to further increase the internal vaporization rate while always maintaining the antifogging state.

  In addition, after the air conditioning control device 27 has partially shifted to the introduction of outside air, when the degree of cloudiness falls to a predetermined second cloudiness threshold L2 that is lower than the first cloudiness threshold L1, the inside air circulation and normal air conditioning control are performed again. It returns to the blowout mode. According to this, it can be determined that the degree of fogging has decreased to the second fogging threshold L2, and thus the anti-fogging coating 24a has been regenerated, and it is possible to return to low fuel consumption air conditioning by internal air circulation.

  Further, the fogging detection device 26 includes a light emitting element and a light receiving element, and calculates the degree of fogging by optical reflection on the glass surface. According to this, a state where the windshield 24 is likely to be clouded cannot be detected, but if the control is performed to increase the internal vaporization rate as much as possible with an acceptable window cloudy state as a threshold, the cost of the cloudy detection means is suppressed. be able to.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 6 is a flowchart for explaining the anti-fogging glass regeneration control during stopping in the third embodiment of the present invention. When the vehicle engine is turned on, the air conditioning control device 27 starts this flowchart as the anti-fogging glass regeneration control, and first determines whether or not the outside air temperature is equal to or lower than a predetermined temperature (for example, 20 ° C.). (Step S1).

  If the determination result is YES and the environmental condition is such that heating is necessary and window fogging may occur, the process proceeds to step S2, and then it is determined whether or not the vehicle is stopped. If the determination result is YES and the vehicle is stopped, the process proceeds to step S3, and it is next determined whether or not there is an occupant in the vehicle interior. For this determination, signals from a seating sensor provided in each seat, a human sensor provided in the passenger compartment, and the like are used.

  If this determination result is NO and there is no occupant in the passenger compartment, the process proceeds to step S4, and finally a blowout from the defroster opening 15 is performed to determine whether or not a predetermined time (for example, 1 minute) has elapsed. . If this determination result is NO and the blowout from the defroster opening 15 has not been performed for a predetermined time, the process proceeds to step S5, and the above determination is repeated while performing the blowout from the defroster opening 15 by introducing the outside air. .

  Therefore, when the determination result of step S1 is NO and the outside air temperature is higher than the predetermined temperature, when the determination result of step S2 is NO and the vehicle is running, when the determination result of step S3 is YES and there is an occupant in the vehicle interior, and If the determination result in step S4 is YES and a predetermined time has elapsed since the defroster was blown, the process proceeds to step S6, and if the set suction, blowing mode, or auto control is set, the state based on that control is set. It is to be migrated.

  As described above, in the present embodiment, the air conditioning control device 27 performs the blowout from the defroster opening 15 by introducing the outside air when the vehicle is in a stopped state and there is no occupant in the passenger compartment as the anti-fogging glass regeneration control. Is performed for a predetermined time. According to this, by using a cold stop, the outside air is temporarily introduced when there is no occupant in the passenger compartment, and the anti-fogging film 24a is dried and regenerated, so that the ventilation heat during traveling can be obtained. The internal vaporization rate for loss reduction can be increased.

  Note that the air conditioning control device 27 is configured to return to the suction mode and the blowing mode in the normal air conditioning control when an occupant is detected in the vehicle interior during the anti-fogging glass regeneration control. According to this, when the occupant returns to the passenger compartment, the occupant's feeling of comfort is not impaired or distrust is not given in an air conditioning state different from the setting, so that the normal air conditioning state is restored.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the first and second embodiments described above, when the surface relative humidity RHw decreases to the second humidity threshold value RH2 after the transition to partial outside air introduction, or when the cloudiness level decreases to the second cloudiness threshold value L2. However, after returning to the blowing mode in the inside air circulation and the normal air-conditioning control, the outside air is partially introduced for a predetermined time (for example, 5 minutes), and then returned to the blowing mode in the inside air introduction and the normal air-conditioning control again. Anyway. According to this, control can be simplified.

  In the first and second embodiments described above, the humidity detection device 25 and the fog detection device 26 are disposed on the windshield 24, but may be disposed on a rear glass or the like behind the vehicle. According to this, compared with the windshield 24, the rear glass tends to cause window fogging. For this reason, by performing humidity detection or fogging detection with a window glass that is easily fogged, it is possible to perform air conditioning control in which any window glass of the vehicle is always maintained in an anti-fogging state.

  In the first and second embodiments described above, when the surface relative humidity RHw and the degree of cloudiness of the windshield 24 reach the first threshold value, the internal air suction mode is switched to the two-layer suction mode of semi-inside air (semi-outside air). However, for example, as the surface relative humidity RHw and the degree of cloudiness increase, the outside air introduction ratio may change so as to increase. Further, drying and regeneration of the anti-fogging film 24a by introducing outside air and defroster blowing performed for a predetermined time during parking or stopping may be performed in accordance with, for example, the surface relative humidity RHw of the windshield 24. .

  Further, in the above-described embodiment, the air passages of the blower unit 1 and the air conditioning unit 10 are divided into the upper first air passage 8 and the lower second air passage 9 by the partition member 11, and the inside / outside air two-layer flow mode is set. Although the vehicle air conditioner that can be set has been described, a normal vehicle air conditioner that does not set the inside / outside air two-layer flow mode, that is, the partition member 11 is not disposed, and the air suction unit reaches the inlet of the blowing mode switching unit. The present invention can also be implemented in a vehicle air conditioner that forms a single air passage. In addition, you may enable it to change the predetermined time etc. which are partly outside air introduction.

It is a cross-sectional schematic diagram which shows schematic structure of the vehicle air conditioner in one Embodiment of this invention, and shows the state of internal air suction mode & foot defroster blowing mode. It is a time chart explaining switching of the inside / outside air mode in 1st Embodiment of this invention. The state of the 2 layer suction mode & foot defroster blowing mode in the vehicle air conditioner of FIG. 1 is shown. The state of the external air suction mode & defroster blowing mode in the vehicle air conditioner of FIG. 1 is shown. It is a time chart explaining switching of the inside / outside air mode in 2nd Embodiment of this invention. It is a flowchart explaining the anti-fogging glass reproduction | regeneration control during a stop in 3rd Embodiment of this invention.

Explanation of symbols

2 ... 1st inside air introduction port (inside air introduction port)
3 ... 2nd inside air introduction port (inside air introduction port)
4 ... Outside air inlet 5 ... First inside / outside air switching door (inside / outside air switching means)
6 ... Second inside / outside air switching door (inside / outside air switching means)
7 ... Blower (blower means)
12 ... Evaporator (cooling heat exchanger)
13 ... Heater core (heat exchanger for heating)
15 ... defroster opening (air outlet)
16. Defroster door (blowout mode switching means)
17 ... Face opening (air outlet)
18 ... Face door (air blowing mode switching means)
22 ... Foot opening (air outlet)
23 ... Foot door (air blowing mode switching means)
24 ... Windshield (window glass)
24a ... Anti-fogging film 25 ... Humidity detection device (humidity detection means)
26: Cloudiness detection device (cloudiness detection means)
27 ... Air conditioning control device (air conditioning control means)
L1 ... first cloudiness threshold L2 ... second cloudiness threshold RH1 ... first humidity threshold RH2 ... second humidity threshold RHw ... surface relative humidity

Claims (12)

A vehicle air conditioner disposed in a vehicle having an antifogging film (24a) on the inner surface of the window glass (24),
Inside / outside air switching means (5, 6) that opens and closes the inside air introduction port (2, 3) and the outside air introduction port (4) to switch between the intake of the inside air and the outside air,
A blowing means (7) for blowing air introduced through the inside air introduction ports (2, 3) and the outside air introduction port (4) toward the vehicle interior;
A cooling heat exchanger (12) for cooling the blowing air of the blowing means (7);
A heating heat exchanger (13) for heating the air blown by the air blowing means (7);
A defroster outlet (15) that blows out air whose temperature is adjusted by passing through the cooling heat exchanger (12) and the heating heat exchanger (13) toward the inner surface of the window glass (24). And a plurality of air outlets (15, 17, 22) having air outlets (17, 22) that are blown out to other parts of the vehicle interior;
Blowing mode switching means (16, 18, 23) for opening and closing the plurality of outlets (15, 17, 22) to switch the blowing mode;
Air-conditioning for vehicles provided with air-conditioning control means (27) for executing inside / outside air switching control by the inside / outside air switching means (5, 6) and blowing mode switching control by the blowing mode switching means (16, 18, 23) In the device
Outside air temperature detecting means for detecting the temperature of the outside air is provided, and the air conditioning control means (27) performs partial air conditioning in addition to normal air conditioning control when the temperature of the outside air detected by the outside air temperature detecting means is equal to or lower than a predetermined temperature. Alternatively, the antifogging glass regeneration control for drying and regenerating the antifogging film (24a) applied to the window glass (24) by temporarily introducing outside air and blowing it into the passenger compartment is performed. Vehicle air conditioner.   Humidity detection means (25) is provided on the inner surface of the window glass (24) to calculate the surface relative humidity (RHw) of the window glass (24), and the air conditioning control means (27) controls the anti-fogging glass regeneration control. As the surface relative humidity (RHw) calculated by the humidity detecting means (25) is less than a predetermined first humidity threshold (RH1), the inside air circulation is performed, and the surface calculated by the humidity detecting means (25) The vehicle air conditioner according to claim 1, wherein when the relative humidity (RHw) reaches the first humidity threshold value (RH1), a part of the outside air is introduced.   Fog detection means (26) is provided on the inner surface of the window glass (24) to detect fog on the surface of the window glass (24), and the air conditioning control means (27) performs the fogging glass regeneration control as the fog prevention glass regeneration control. Inside air is introduced when the cloudiness level detected by the detection means (26) is less than a predetermined first cloudiness threshold (L1), and the cloudiness level detected by the cloudiness detection means (26) is the first cloudiness threshold (L1). 2. The vehicle air conditioner according to claim 1, wherein a part of the outside air is introduced when the air reaches the vehicle air conditioner.   When the part of the outside air is introduced, the introduced outside air is blown out from the defroster outlet (15), and the circulating inside air is blown out from the outlets (17, 22) other than the defroster outlet (15). The vehicle air conditioner according to claim 2 or 3.   After the air conditioning control means (27) shifts to the introduction of the partial outside air, the surface relative humidity (RHw) decreases to a predetermined second humidity threshold (RH2) lower than the first humidity threshold (RH1). Or when the cloudiness level falls to a predetermined second cloudiness threshold value (L2) lower than the first cloudiness threshold value (L1), the internal air circulation and the blowout mode in the normal air conditioning control are restored. The vehicle air conditioner according to any one of claims 2 to 4.   5. The air conditioning control means (27) according to any one of claims 2 to 4, wherein after the partial outside air introduction is performed for a predetermined time, the inside air introduction and the blowing mode in the normal air conditioning control are restored again. Vehicle air conditioner.   The said humidity detection means (25) is provided with a relative humidity detection means, an air temperature detection means, and a glass temperature detection means, and calculates the said surface relative humidity (RHw) from these detection results. The vehicle air conditioner described in 1.   4. The vehicle air conditioner according to claim 3, wherein the fog detecting means (26) includes a light emitting element and a light receiving element, and calculates the degree of fogging by optical reflection on the glass surface.   The air conditioner for vehicles according to any one of claims 2, 3, 7, and 8, wherein the humidity detecting means (25) or the fogging detecting means (26) is arranged on a window glass at the rear of the vehicle. apparatus.   As the anti-fogging glass regeneration control, the air conditioning control means (27) blows out the defroster outlet (15) by introducing outside air after the vehicle has been driven and the vehicle running engine is turned off. The vehicle air conditioner according to claim 1, which is performed for a predetermined time.   The air-conditioning control means (27), as the anti-fogging glass regeneration control, blows out the defroster outlet (15) for a predetermined time by introducing outside air when the vehicle is stopped and no passenger is present in the passenger compartment. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is performed.   The said air-conditioning control means (27) returns to the suction mode and blowing mode in normal air-conditioning control, when a passenger | crew is detected in the said vehicle interior during the said anti-fog glass reproduction | regeneration control. Vehicle air conditioner.

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